SBN71-120 thru SBN85-390, SBD30-150/199 TANK TYPE COMMERCIAL
GAS WATER HEATER SERVICE HANDBOOK
TEST 3 - CONTINUITY CHECK OF HIGH LIMIT (ECO)
Conditions:
●Power On – No Hot Water
●Red, heater control “Call for Heat” LED – on
●Red ignition control board diagnostic LED – 4 Flashing
●Note LED Flash Code before resetting water heater control.
●See Description of diagnostic LED Flashes.
●Turn Power “Off”
0.0
Ohms
TEST 3 | Continuity check of ECO (energy | |
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Black to Black wires of upper probe. Power is off. | ||
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If… | then |
continuity is indicated (ZERO “0.0” Resistance) | opens at 203° F; closes at 193° F. If water is |
| below 193° F, continuity is correct. |
continuity is not present (meter reads “0.L”) | replace ECO sensor, if water temperature is |
| below 193° F. |
water is less than 120° F | •reset status LED should be on. |
| •replace heater control if control will not manually |
| reset. |
State Water Heaters | 36 | Technical Training Department |
Ashland City, Tennessee © 2007 |
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